Caterham (EAO) Switch Help Needed

[DanM]

I am about to start wiring my new Caterham (eao) switches and need help understanding the connections points (13, 14, X1, X2 etc.) at the back.  Anyone able to help?

[MV8]

Make two tables, with each pin name as a row (13,14,x1,x2) and as  columns. Fill the first table with resistance checks between each pin.  Press the button once and fill the second table.

 

One terminal will go to all the left turn bulbs, one to the right turn bulbs, no connection when the switch is off but shorted when on along with a third terminal from a two pin flasher with the other flasher pin going to the fuse for B+. The last terminal would short to the haz flasher terminal when the haz switch is off to feed the turn signal indicator toggle that splits power to the left and right turn signals in parallel to the haz switch and would use one flasher for haz and turn. This is only one way to wire it.

 

Since your switch is missing four terminals it  may not light up with the parking lamps or when on.

Edited July 25, 2023 by MV8

[MV8]

You are just trying to replace the miata oem haz button with this, is that correct? You still need to determine what the pins do when the CAT button is pressed.

[DanM]

I have three buttons (Haz, Demist, Horn) and have managed to get the following functionality:

 

• Button on/off - Pass
• Button Illumination w/ sidelights on - Pass
• Button Illumination when button on - Fail

I am now exploring an Arduino set up to get the illumination I need. Do you have experience with that?

 

 

[MV8]

As I recall, you are using a 90-93 miata donor. It sounds like you have connected the four terminals correctly. The problem is the haz switch controls ground, not power to the flasher unit. A diode could be spliced into the red wire from the panel light control switch to the haz switch (stripe toward the panel light control switch) and jumper the haz swithc side to the orange wire, so cutting the hazards on does not light up all the parking lamps. (Diode won't work as it will cause the parking lamps to activate the hazard flasher). Another option is to add a relay between the haz switch and the flasher unit to provide ground to the flasher and power to the bulb at the same time. Many different ways to do it. 

 

Familiar with arduino projects but no first hand experience.

Edited July 29, 2023 by MV8
correct diode reference.